First one that pops to mind (as he's kind of everywhere at the minute) is Steve McCurry. It is a tricky one though, because famous people do tend to hang around in famous people land! While some famous portraitists might not focus on celebrities, you'll be hard pressed to find one who hasn't shot a few. David Eustace comes to mind for that point. See his 'The Character Project' for non-celebs.

Quote Originally Posted by cliveh View Post
Actually, Edward Sheriff Curtis may qualify for this.
You'll need to reformat your OP in past tense of course, if Edward Curtis is being counted as an exception to the rule. There weren't many celebs back then! Indian or otherwise...